[MotionMark] The text "kkkj" is causing Firefox console warning: `unreachable code after return statement`

[kUVoxnV8F4Qp]

See https://github.com/WebKit/webkit/search?utf8=%E2%9C%93&q=kkkj&type=
or:
$ grep -nrIFw kkkj
Websites/browserbench.org/MotionMark1.1/resources/extensions.js:403:        return ((this._a.y * t + this._b.y) * t + this._c.y) * t;kkkj
Websites/browserbench.org/MotionMark/resources/extensions.js:374:        return ((this._a.y * t + this._b.y) * t + this._c.y) * t;kkkj
PerformanceTests/MotionMark/resources/extensions.js:403:        return ((this._a.y * t + this._b.y) * t + this._c.y) * t;kkkj

This looks like navigation text from an editor(like vim, emacs) where pressing 'k' causes cursor to go up one line, 'j' is go down one line, 'l' is go right one char and 'h' is go left one char.

[Radar WebKit Bug Importer]

<rdar://problem/49839036>

[Said Abou-Hallawa]

This gibberish was added in <http://trac.webkit.org/changeset/197908>.

[Jon Lee]

-_____-

[Jon Lee]

Created attachment 367428 [details]
Patch

[Wenson Hsieh]

Comment on attachment 367428 [details]
Patch

rs=me

[WebKit Commit Bot]

Comment on attachment 367428 [details]
Patch

Clearing flags on attachment: 367428

Committed r244357: <https://trac.webkit.org/changeset/244357>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.